Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c069dcc11e50d2a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-05 00:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89f09128ce1546899831566c71b332e4 SHA-1: 2a2e7a3dbfde4b2c14bbdf588fbed28cde1e84e4 SHA-256: 2c069dcc11e50d2af84e45d1e6e068fc86c735e8a4d6c77499947c71141b5bfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=equation+of+line+from+graph+worksheet+pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021517057194235.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t09ojghr0dpqh2aof8l01k948j/39257951848.pdf
    • https://banghenails.com/upload/file/65126929795.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/625da8f9866c591829d5cccceb4c4f66/69408342331.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/93vren2f5eonbq96pfg1ehcl10/3597799692.pdf
    • http://oodow.cn/upload/file/2106180446380123834b195hao073p.pdf
    • http://botosani.ro/img/uploads/file/larelulewinive.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ec97743e6d6---dininepusofirapusufekixo.pdf
    • http://bitite.lv/media/txt/122/file/69971578416.pdf
    • http://shinex-auto.com/userfiles/file/46025404235.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/17913207407.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef56c5f3bb---salasedugikizugozisopoxej.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612e4f80cd9de---dotosajoxek.pdf
    • http://schodylux.pl/userfiles/file/paponakuvimukem.pdf
    • http://inimtrento.it/userfiles/files/58325813396.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e808900ae---selezijamudi.pdf
    • https://jajugroup.com/ckfinder/userfiles/files/fimajojuwefid.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/6ikv6ts287jn6ibseurr92pu8s/dogawopak.pdf
    • http://studiogiamberardino.it/userfiles/files/wiropotirorikeg.pdf
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/81841497008.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085955c39c68---raxuxowered.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8e3.bin
443b1739c5dd8a5bebce9414e5677cbe691d84684309d048a6de079409331bd7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E3 17252 bytes
font_01_sfnt_off0000e578.bin
4ee14b473e9116815a3fc9a12239af7dac33093c58157a635dedc46a5d9ecc68
pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 11352 bytes
font_02_sfnt_off0000ff86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 16792 bytes